parked truck to replace all fuel lines, deleted vapor line. removed air pump and vapor canister, removed all vacuum lines. pluged all ports and air tubes. have code 37. read about dist. pickup in other threads. is there a way to test pickup before replacing it. i really dont want to just throw parts at it, i was a parts counterman for years and always discouraged my customers from doing that. any and all help very welcome. thanks. :help: